Abstract: An acoustic generator according to an embodiment includes at least a plurality of piezoelectric elements (exciters) and a vibrating portion. The piezoelectric elements vibrate upon reception of input of an electric signal. The piezoelectric elements are attached to the vibrating portion. The piezoelectric elements are attached to the vibrating portion asymmetrically with respect to all the symmetry axes of a figure drawn by a contour of the vibrating portion when seen from the above.

Abstract: There are provided an acoustic generator capable of generating a high-quality sound having little distortion, and an acoustic generation device and an electronic apparatus using the same. An acoustic generator has a vibration body, a first exciter, a second exciter, a first damping material and a second damping material. The vibration body has two surfaces which are positioned with a gap therebetween in a first direction. The first exciter and the second exciter are disposed on the vibration body. The first damping material is disposed on the vibration body and has a first portion which overlaps the first exciter when viewed in the first direction. The second damping material is disposed on the vibration body and has a second portion which overlaps the second exciter when viewed in the first direction.

Abstract: An acoustic generator includes a vibration body; a first exciter and a second exciter which are disposed on the vibration body; a first damping material disposed on the vibration body and having a first portion which overlaps the first exciter; and a second damping material disposed on the vibration body and having a second portion which overlaps the second exciter. The first damping material is disposed so as to straddle at least a portion of a first segment which is a portion of a contour of the first exciter which portion does not face the second exciter, and the second damping material is disposed so as to straddle at least a portion of a second segment which is a portion of a contour of the second exciter which portion does not face the first exciter.

Abstract: A sound generator 30 includes a piezoelectric element 1, a vibrating body 3a, a reflection member 81, a reflection member 82, an opening 21, and an opening 22. The vibrating body 3a vibrates due to vibration of the piezoelectric element 1 and generates a sound. The reflection member 81 is disposed in a first direction from the vibrating body 3a so as to be inclined with respect to the vibrating body 3a. The reflection member 82 is disposed in a second direction, which is opposite to the first direction, from the vibrating body 3a so as to face the reflection member 81 with the vibrating body 3a therebetween and so as to be inclined with respect to the vibrating body 3a. The opening 21 faces in a third direction. The opening 22 faces in a fourth direction, which is different from the third direction.

Abstract: There are provided an acoustic generator capable of generating a high-quality sound having little distortion, and an acoustic generation device and an electronic apparatus using the same. An acoustic generator has a vibration body, a first exciter, a second exciter, a first damping material and a second damping material. The vibration body has two surfaces which are positioned with a gap therebetween in a first direction. The first exciter and the second exciter are disposed on the vibration body. The first damping material is disposed on the vibration body and has a first portion which overlaps the first exciter when viewed in the first direction. The second damping material is disposed on the vibration body and has a second portion which overlaps the second exciter when viewed in the first direction.

Abstract: An acoustic generator includes a vibration body; a first exciter and a second exciter which are disposed on the vibration body; a first damping material disposed on the vibration body and having a first portion which overlaps the first exciter; and a second damping material disposed on the vibration body and having a second portion which overlaps the second exciter. The first damping material is disposed so as to straddle at least a portion of a first segment which is a portion of a contour of the first exciter which portion does not face the second exciter, and the second damping material is disposed so as to straddle at least a portion of a second segment which is a portion of a contour of the second exciter which portion does not face the first exciter.

Abstract: The vibration device includes a vibration body, an exciter, and a load member. The exciter causes the vibration body to vibrate. The load member is attached to a part of the vibration body. The load member is not contacted to the exciter. The load member is configured to reduce an amplitude of the part of the vibration body where the load member is attached.

Abstract: Provided are a sound generator and an electronic apparatus using the same. The sound generator includes a vibrating body, an exciter that is attached to the vibrating body and bends to vibrate the vibrating body in the thickness direction of the vibrating body by vibrating the exciter itself, an enclosure that is joined to the vibrating body and forms a first space enclosed together with the vibrating body, and a duct that connects between the first space and the external space. A spacing between the vibrating body and the surface of the enclosure facing the vibrating body is smaller than ½ of the length of the wavelength of resonance having the lowest frequency in the bending vibration of the vibrating body.

Abstract: An acoustic generator according to an embodiment includes a film-shaped vibrating body, a flame, and an exciter. The frame is configured to fix at least both ends of the vibrating body in a second direction perpendicular to a first direction that is a thickness direction of the vibrating body. The exciter is disposed on the vibrating body, and is configured to vibrate itself to vibrate the vibrating body. The vibrating body has a value of an average coefficient of linear expansion during a temperature change from 90° C. to 40° C. set to be not less than a value of the average coefficient of linear expansion of the vibrating body during a temperature change from 40° C. to 90° C., and set to be not less than a value of an average coefficient of linear expansion of the flame during a temperature change from 90° C. to 40° C.

Abstract: An acoustic generator according to an aspect of an embodiment includes a piezoelectric element (exciter), a vibrating body. The piezoelectric element receives an input of an electrical signal and is caused to vibrate. The piezoelectric element is mounted on the vibrating body, and the vibrating body is caused to vibrate by the vibration of the piezoelectric element. The acoustic generator includes at least one pair of two adjacent portions with different stiffnesses in a plan view, and has at least one damper provided contacting with both of the two adjacent portions.

Abstract: An acoustic generator according to an aspect of an embodiment includes a frame, a vibration body, and a piezoelectric vibration element. The vibration body is provided at an inner side of the frame. The piezoelectric vibration element is provided on the vibration body. The vibration body has a configuration in which a thin plate-like first portion and a thin plate-like second portion having different elastic moduli are laminated.

Abstract: An acoustic generator according to one embodiment includes a piezoelectric element (exciter), a vibrating portion, and a plurality of dampers. The piezoelectric element receives an input of an electrical signal and is caused to vibrate. The piezoelectric element is mounted on the vibrating portion, and the vibrating portion is caused to vibrate by the vibration of the piezoelectric element. The dampers are integrated with the vibrating portion. The dampers are asymmetrically provided with respect to an axis of symmetry of a shape delineated by the outline of the vibrating portion, in a plan view of the vibrating portion from a side on which the piezoelectric element is mounted.

Abstract: The problem is to reduce variations of sound pressure in the sound pressure frequency characteristics. To solve the problem, an acoustic generator includes a film that is a supporting plate; a frame member that is provided on the outer circumference of the film; a piezoelectric element that is provided on the film within a frame of the frame member; and a resin layer that is provided on the film within the frame of the frame member, and the resin layer including an air bubble. By the air bubble, a decrease in the sound pressure is prevented, peaks and dips in the frequency characteristics of sound pressure are reduced, and high-quality sounds are generated.

Abstract: Provided is an acoustic generator which has a high sound pressure at ultrahigh frequencies and which can suppress occurrence of large peak dips. An acoustic generator includes a film, a frame member disposed on an outer peripheral edge of the film, a piezoelectric element disposed on the film and inside the frame member, and a resin layer filled inside the frame member so as to cover the piezoelectric element.

Abstract: A sound generator 30 includes a piezoelectric element 1, a vibrating body 3a, a reflection member 81, a reflection member 82, an opening 21, and an opening 22. The vibrating body 3a vibrates due to vibration of the piezoelectric element 1 and generates a sound. The reflection member 81 is disposed in a first direction from the vibrating body 3a so as to be inclined with respect to the vibrating body 3a. The reflection member 82 is disposed in a second direction, which is opposite to the first direction, from the vibrating body 3a so as to face the reflection member 81 with the vibrating body 3a therebetween and so as to be inclined with respect to the vibrating body 3a. The opening 21 faces in a third direction. The opening 22 faces in a fourth direction, which is different from the third direction.

Abstract: A vibration device includes a first frame member, a first vibration body, a second frame member, a second vibration body, and an exciter. The first vibration body is provided in an inner region of the first frame member. The second frame member is attached to the first vibration body with a spacing from the first frame member. The second vibration body is provided in an inner region of the second frame member with a spacing from the first vibration body. The exciter is attached to the second vibration body.

Abstract: An acoustic generator according to an embodiment includes a film-shaped vibrating body, a flame, and an exciter. The frame is configured to fix at least both ends of the vibrating body in a second direction perpendicular to a first direction that is a thickness direction of the vibrating body. The exciter is disposed on the vibrating body, and is configured to vibrate itself to vibrate the vibrating body. The vibrating body has a value of an average coefficient of linear expansion during a temperature change from 90° C. to 40° C. set to be not less than a value of the average coefficient of linear expansion of the vibrating body during a temperature change from 40° C. to 90° C., and set to be not less than a value of an average coefficient of linear expansion of the flame during a temperature change from 90° C. to 40° C.

Abstract: An acoustic generator according to an embodiment includes at least a plurality of piezoelectric elements (exciters) and a vibrating potion. The piezoelectric elements vibrate upon reception of input of an electric signal. The piezoelectric elements are attached to the vibrating potion. The piezoelectric elements are attached to the vibrating potion asymmetrically with respect to all the symmetry axes of a figure drawn by a contour of the vibrating potion when seen from the above.

Abstract: Provided are a sound generator including a frame body, a vibration body provided to the frame body in a state where a tensile force is applied to the vibration body, and a piezoelectric vibration element provided to the vibration body. In the sound generator, when a first direction and a second direction are directions along a main surface of the vibration body and intersect with each other, the tensile force in the first direction and the tensile force in the second direction are different from each other. A sound generation device and an electronic apparatus including the sound generator are also provided.

Abstract: Provided are a sound generator and an electronic apparatus using the same. The sound generator includes a vibrating body, an exciter that is attached to the vibrating body and bends to vibrate the vibrating body in the thickness direction of the vibrating body by vibrating the exciter itself, an enclosure that is joined to the vibrating body and forms a first space enclosed together with the vibrating body, and a duct that connects between the first space and the external space. A spacing between the vibrating body and the surface of the enclosure facing the vibrating body is smaller than ½ of the length of the wavelength of resonance having the lowest frequency in the bending vibration of the vibrating body.